Libav
ivfenc.c
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1 /*
2  * Copyright (c) 2010 Reimar Döffinger
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 #include "avformat.h"
21 #include "libavutil/intreadwrite.h"
22 
24 {
25  AVCodecContext *ctx;
26  AVIOContext *pb = s->pb;
27 
28  if (s->nb_streams != 1) {
29  av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
30  return AVERROR(EINVAL);
31  }
32  ctx = s->streams[0]->codec;
33  if (ctx->codec_type != AVMEDIA_TYPE_VIDEO || ctx->codec_id != AV_CODEC_ID_VP8) {
34  av_log(s, AV_LOG_ERROR, "Currently only VP8 is supported!\n");
35  return AVERROR(EINVAL);
36  }
37  avio_write(pb, "DKIF", 4);
38  avio_wl16(pb, 0); // version
39  avio_wl16(pb, 32); // header length
40  avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));
41  avio_wl16(pb, ctx->width);
42  avio_wl16(pb, ctx->height);
43  avio_wl32(pb, s->streams[0]->time_base.den);
44  avio_wl32(pb, s->streams[0]->time_base.num);
45  avio_wl64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?
46 
47  return 0;
48 }
49 
51 {
52  AVIOContext *pb = s->pb;
53  avio_wl32(pb, pkt->size);
54  avio_wl64(pb, pkt->pts);
55  avio_write(pb, pkt->data, pkt->size);
56 
57  return 0;
58 }
59 
61  .name = "ivf",
62  .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
63  .extensions = "ivf",
64  .audio_codec = AV_CODEC_ID_NONE,
65  .video_codec = AV_CODEC_ID_VP8,
66  .write_header = ivf_write_header,
67  .write_packet = ivf_write_packet,
68 };
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:336
Bytestream IO Context.
Definition: avio.h:68
static int ivf_write_header(AVFormatContext *s)
Definition: ivfenc.c:23
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:974
AVOutputFormat ff_ivf_muxer
Definition: ivfenc.c:60
static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ivfenc.c:50
Format I/O context.
Definition: avformat.h:922
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:260
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
uint8_t * data
Definition: avcodec.h:973
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
void avio_wl64(AVIOContext *s, uint64_t val)
Definition: aviobuf.c:324
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
int width
picture width / height.
Definition: avcodec.h:1224
const char * name
Definition: avformat.h:446
#define AV_RL32
Definition: intreadwrite.h:146
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
AVIOContext * pb
I/O context.
Definition: avformat.h:964
main external API structure.
Definition: avcodec.h:1050
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1082
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:756
Main libavformat public API header.
int den
denominator
Definition: rational.h:45
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:741
This structure stores compressed data.
Definition: avcodec.h:950
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966